What is cited as a primary trigger for vocalization driven by instinct in the Basset Fauve de Bretagne?

Answer

Following a scent trail

Following a scent trail, driven by prey drive, is listed as a primary activator, as the nose leads the way during scent pursuit.

What is cited as a primary trigger for vocalization driven by instinct in the Basset Fauve de Bretagne?
behaviorDogbarkSoundbreed